Documented specifications
Snom · The manufacturer published a June 10, 2026 datasheet and current product page at review; regional inventory, remaining support period and price were not verified.
| Specification | Documented value |
|---|---|
| Display | 5-inch 480 × 272 IPS color display; not documented as touch Source ↗ |
| Programmable keys | 8 physical SmartLabel keys across four pages, mapping up to 32 functions Source ↗ |
| SIP identities and calls | 12 SIP identities/accounts and a published maximum of 12 simultaneous calls; PBX and service acceptance still required Source ↗ |
| Ethernet and power | Two Gigabit RJ45 ports; IEEE 802.3af PoE class 3 or optional 5 V, 2 A, 10 W adapter Source ↗ |
| USB and expansion | One USB 2.0 Type-A port; manufacturer documents connection for up to three D8C modules Source ↗ |
| Wireless | No integrated Wi-Fi or Bluetooth documented; optional A210 Wi-Fi, A220 Bluetooth and A230 DECT dongles are listed Source ↗ |
| Headsets | RJ9 headset, EHS socket and documented USB, DECT and Bluetooth-dongle accessory paths Source ↗ |
| Protection and management | SIP over TLS, SRTP/SRTCP, HTTPS, 802.1X, OpenVPN, SRAPS and remote-management protocols are documented capabilities Source ↗ |
Unlisted fields remain unverified. Platform compatibility and remaining support life require confirmation for the exact ordered model.
Keep the D812 inside its exact-model boundary
The D812 is a wired D8xx desk phone with a fixed 5-inch 480 × 272 IPS display and eight physical SmartLabel keys. Each key can map functions across four pages, producing up to 32 assignments; that is not 32 physical keys. The display is not documented as touch. Do not transfer the D862's tilting 1280 × 720 panel or the D815W and D815WB radio and key specifications to this model.
Record the product number, regional SKU, hardware revision, ordered accessories and installed firmware. The current manufacturer page and June 10, 2026 datasheet establish published features, not local availability, price, fleet support life or interoperability with a selected PBX.
Separate identities, keys and active calls
Snom publishes 12 SIP identities or accounts and up to 12 simultaneous calls. Those quantities remain distinct from eight physical SmartLabel keys, 32 paged assignments, monitored BLF targets and the number of calls a PBX or provider permits. A line key can present state or select an account without increasing service capacity.
Pilot the intended account layout, inbound selection, outbound identity, hold, attended and blind transfer, conference, call park, pickup and BLF behavior on the chosen platform. Datasheet footnotes mark several call features as PBX-dependent or software-optional; a feature name in the phone does not establish server support.
Budget power and the single USB path
The base phone accepts IEEE 802.3af PoE class 3 or the separately available 5 V, 2 A, 10 W adapter and provides two Gigabit Ethernet ports. Its single USB Type-A port is shared by expansion and accessory choices. The datasheet documents up to three D8C modules, but does not turn that maximum into proof that every three-module and USB-accessory combination is powered by the selected PoE switch.
Build an exact accessory and power bill before purchase. Verify D8C cabling, any required external power, PoE allocation, PC pass-through, LLDP-MED and VLAN behavior under restart and switch failover. Connector presence is not evidence of simultaneous accessory compatibility or sufficient power.
Treat every wireless path as an optional accessory
The D812 does not document integrated Wi-Fi or Bluetooth. Snom lists the A210 Wi-Fi, A220 Bluetooth and A230 DECT dongles as separate compatible accessories. Each consumes the phone's USB or associated connection path and adds its own firmware, regional, headset or network acceptance work. Do not describe the base D812 as a wireless phone merely because a dongle can be added.
Likewise, RJ9, EHS, USB, DECT-dongle and Bluetooth-dongle headsets are different control and audio paths. Verify answer and end, mute, volume, caller alerts, range, coexistence and recovery with the exact headset and accessory combination. Manufacturer compatibility is not a measured deployment result.
Bind firmware, provisioning and protection to the PBX
The phone documents HTTPS, SRAPS, DHCP provisioning options, TR-069, TR-369, SIP over TLS, SRTP, SRTCP, 802.1X and OpenVPN. These are capabilities, not evidence that certificate validation, protected signaling, protected media, network admission or management authorization is active. Record the provisioning owner, trust anchors, identity, transport and negotiated media separately.
Snom warns that a PBX may constrain firmware and may own the update path. Match the exact D812 build to the selected PBX or provider before upgrading, preserve the approved previous build and recovery method, and export only the minimum diagnostic evidence. SIP traces, PCAP and syslog can contain credentials, identities and conversation metadata.
Run exact acceptance and lifecycle checks
Test cold start, provisioning, registration, inbound and outbound identity, two-way audio, DTMF, hold, transfers, BLF or pickup, voicemail indication, emergency-location policy, network recovery and every ordered accessory. Repeat the essential workflow after a managed restart and after the approved firmware update. Keep any rollback inside the PBX and Snom-supported path.
Confirm regional inventory, replacement policy, security-update process, warranty, support entitlement and price directly for the intended order. No D812, firmware, PBX, provider, account, accessory, radio, power combination, protected session, emergency workflow, availability, price or live call was tested for this guide.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.
- Snom D812 product page ↗
- Snom D812 datasheet, revision 4 ↗
- Snom D812 short user manual, revision 2 ↗
- Snom Firmware Update Center ↗
- Snom PBX partner directory ↗
Examples require adaptation to your topology. No live PBX or hardware testing is claimed.